Infusion preparation

ABSTRACT

An object of the present invention is to provide an infusion preparation in which the Maillard reaction between an amino acid and a reducing sugar does not occur during storage and the size of fat particles in the fat emulsion does not increase during storage, and in which various types of vitamins can be incorporated in a stable manner, in spite of the fact that it is a two-chamber infusion preparation. Furthermore, even if only one of the infusions (of the infusion preparation) is administered, the patient is unlikely to develop hyperkalemia, vascular pain, or phlebitis. The present invention provides an infusion preparation containing two chambers separated by a partition that can be communicably opened, wherein a first chamber contains a first-chamber infusion containing a sugar and a fat emulsion, a second chamber contains a second-chamber infusion containing an amino acid and an electrolyte, the first-chamber infusion is substantially free of potassium, and has a relative osmotic pressure of 2.0 to 3.0, the second-chamber infusion has a potassium concentration of 40 mEq/L or less and a relative osmotic pressure of 2.5 to 3.5, and a mixture of the first- and second-chamber infusions has a potassium concentration of 16 mEq/L or more as measured upon communicably opening the partition.

This application is a divisional of U.S. application Ser. No. 14/974,534filed Dec. 18, 2015, which is a divisional of U.S. application Ser. No.13/990,018 filed Aug. 9, 2013, which is a National Stage ofInternational Application No. PCT/JP2011/077392 filed Nov. 28, 2011,claiming priority based on Japanese Patent Application No. 2010-265611filed Nov. 29, 2010, the contents of all of which are incorporatedherein by reference in their entirety.

TECHNICAL FIELD

The present invention relates to an infusion preparation containing asugar, a fat, an amino acid, and an electrolyte. More specifically, thepresent invention provides an infusion preparation, which is an infusionpreparation (a high-calorie infusion preparation) contained in atwo-chamber container, wherein a first chamber contains a sugar and afat emulsion, and a second chamber contains an amino acid and anelectrolyte.

BACKGROUND ART

An infusion preparation containing a sugar, an amino acid, and anelectrolyte contained in an infusion bag having two chambers is knownand widely used for the nutritional management of patients (seeNon-Patent Literature 1).

Adding a reducing sugar and an amino acid to the same solutiondisadvantageously causes the Maillard reaction and modifies thesolution. Therefore, in the infusion preparation, in order to preventthe Maillard reaction caused by a reducing sugar and an amino acid, aninfusion containing a reducing sugar is placed in one chamber of aninfusion bag, and an infusion containing an amino acid is separatelyplaced in the other chamber. At the time of use, the infusions are mixedby bringing the two chambers into communication with each other and 30subsequently administered to the patient. In order to facilitate themixing procedure, the two chambers are generally separated by apartition wall (for example, an easily peelable seal) that can becommunicably opened at the time of use. However, there is a case whereonly one infusion is administered to the patient due to the omission ofthe communication procedure. Such an error often occurs. Therefore, whensuch an infusion preparation in a two-chamber container is used, it isvery important to ensure that the patient is prevented from beingadversely affected even in the case where only one infusion placed inone chamber is administered due to the omission of the communicationprocedure before use.

For example, when the potassium concentration in one infusion isrelatively high, a patient may develop hyperkalemia if this infusion issingly administered thereto. In order to eliminate such a problem, aninfusion preparation in which potassium is separately placed into thetwo chambers and the potassium concentration in each infusion isadjusted to 40 mEq/L or less has been examined (Patent Literature 1).

Further, particularly when an infusion is administered into a peripheralvein, if the osmotic pressure is too high, it may cause vascular pain orphlebitis. Therefore, it is considered to be desirable that an infusionhave an appropriate osmotic pressure even before being mixed (Patent.Literature 2).

Further, when an infusion preparation containing a sugar, an amino acid,and an electrolyte (a high-calorie infusion preparation) is singlyadministered for a long period of time, it may induce essential fattyacid deficiency. The development of essential fatty acid deficiency canbe prevented by the administration of a fat emulsion in combination witha high-calorie infusion preparation. Further, fat has a high calorificvalue per weight, and also has advantages such as the face that, unlikesugar, it does not cause osmotic diuresis. However, when a long time haselapsed after an electrolyte infusion and a fat emulsion were mixedtogether, the size of fat droplets becomes large, leading to the risk ofcausing fat embolism when such a mixture is administered. Therefore, aninfusion preparation in a two-chamber container in which a fat emulsionand an electrolyte are placed in different chambers and mixed at thetime of administration has been developed.

Still further, it is known that acidosis may occur when a vitamin B1deficiency occurs during the administration of a high-calorie infusion,and vitamin supplementation is required to prevent such a risk whenadministering a high-calorie infusion. In order to avoid such a problem,a high-calorie infusion preparation comprising three liquids (liquids inlarge, medium, and small chambers) to which vitamins, in addition to asugar, an amino acid, and an electrolyte, are added in advance has beendeveloped (for example, the Fulcaliq infusion preparation). Thehigh-calorie infusion preparation is prepared in a form that containsinfusions having different compositions in large, medium, and smallchambers, in view of problems in the stability of vitamins (particularlyfat-soluble vitamins). However, infusion preparations having threechambers require additional work during production and use, thuscreating problems with production cost and use. Further, for example,the package insert for the Fulcaliq infusion preparation instructs theuser not to mix a fat emulsion as a precaution during preparation.

As described above, techniques that have been examined with respect tovarious problems are useful in solving the respective problems; however,an infusion preparation that has solved all of the problems was yet tobe developed.

CITATION LIST Patent Literature

PTL 1: Japanese Unexamined Patent Publication No. 2004-189677

PTL 2: Japanese Unexamined Patent Publication No. 2003-95937

Non-Patent Literature

NPL Japanese Pharmacology & Therapeutics, 24(10), 2151 (1996)

TECHNICAL PROBLEMS

An object of the present invention is to develop an infusion preparationthat can solve all of the above problems.

SOLUTION TO PROBLEMS

The present inventors surprisingly found that the following advantagescan be achieved by using an infusion preparation comprising two chambersseparated by a partition that can be communicably opened, wherein afirst chamber contains a first-chamber infusion comprising a sugar and afat emulsion, a second chamber contains a second-chamber infusioncomprising an amino acid and an electrolyte, the first-chamber infusionis substantially free of potassium and has a relative osmotic pressureof 2.0 to 3.0, the second-chamber infusion has a potassium concentrationof 40 mEq/L or less and a relative osmotic pressure of 2.5 to 3.5, and amixture of the first-and second-chamber infusions has a potassiumconcentration of 16 mEq/L or more as measured upon communicably openingthe partition. In this infusion preparation, the Maillard reactionbetween an amino acid and a reducing sugar does not occur duringstorage, and the size of fat particles in the fat emulsion does notincrease during storage. Even if only one of the infusions isadministered, the patient is unlikely to develop hyperkalemia, vascularpain, or phlebitis. In spite of the fact that it is a two-chamberinfusion preparation, various types of vitamins can be incorporated in astable manner. The present inventors made further improvements, andfinally accomplished the present invention.

More specifically, the present invention includes the infusionpreparations itemized below.

Item 1. An infusion preparation comprising two chambers separated by apartition that can be communicably opened, wherein

a first chamber contains a first-chamber infusion comprising a sugar anda fat emulsion;

a second chamber contains a second-chamber infusion comprising an aminoacid and an electrolyte;

the first-chamber infusion is substantially free of potassium, and has arelative osmotic pressure of 2.0 to 3.0;

the second-chamber infusion has a potassium concentration of 40 mEq/L orless and a relative osmotic pressure of 2.5 to 3.5;

and a mixture of the first- and second-chamber infusions has a potassiumconcentration of 16 mEq/L or more as measured upon communicably openingthe partition.

Item 2. The infusion preparation according to Item. 1 wherein thefirst-chamber infusion has a pH of 4.5 to 6.5, and the second-chamberinfusion has a pH of 6.0 to 7.4.Item 3. The infusion preparation according to Item 1 or 2, wherein thevolume ratio of the first-chamber infusion to the second-chamberinfusion is 3:2 to 3:5.Item 4. The infusion preparation according to any one of Items 1 to 3,wherein the first chamber further contains vitamin B1.Item 5. The infusion preparation according to Item 4 wherein thefirst-chamber infusion further contains vitamin A, vitamin B6, vitaminB12, vitamin D, vitamin E, and vitamin K, and the second-chamberinfusion further contains vitamin C and vitamin B2.

ADVANTAGEOUS EFFECTS OF INVENTION

The infusion preparation of the present invention solves all of theabove problems. In the infusion preparation, the Maillard reactionbetween an amino acid and a reducing sugar does not occur duringstorage, and the size of fat particles in the fat emulsion does notincrease during storage. Furthermore, even if only one of the infusionsis administered, the patient is unlikely to develop hyperkalemia,vascular pain, or phlebitis. Furthermore, vitamin B1 incorporated isexpected to inhibit the onset of acidosis. Moreover, because theinfusion preparation is contained in a two-chamber container in whichother vitamins, such as lipid soluble vitamins, can be incorporated, thetime and labor required in the manufacturing process and use can bereduced.

DESCRIPTION OF EMBODIMENTS

The present invention is described below in more detail. The presentinvention provides an infusion preparation comprising two chambersseparated by a partition that can be communicably opened, wherein afirst chamber contains a first-chamber infusion comprising a sugar and afat emulsion, and a second chamber contains a second-chamber infusioncomprising an amino acid and an electrolyte.

First-Chamber Infusion

The first-chamber infusion used in the present invention comprises asugar and a fat emulsion.

Examples of sugars that can be incorporated in the first-chamberinfusion include reducing sugars such as glucose, fructose, and maltose;non-reducing sugars such as xylitol, sorbitol and glycerol; etc. Amongthese sugars, reducing sugars are preferable, and glucose isparticularly preferable, from the viewpoint of blood glucose levelmanagement, etc. Such sugars may be used singly or in a combination oftwo or more.

The amount of sugar in the first-chamber infusion is preferably in therange of 70 to 150 g/L. In the infusion preparation of the presentinvention, the mixture of the first-and second-chamber infusions maypreferably have a sugar concentration of 50 to 100 g/L, and morepreferably 50 to 75 g/L.

To prevent the onset of acidosis during infusion therapy, vitamin B1 ispreferably incorporated in the first-chamber infusion. Examples ofvitamin B1 that can be incorporated in the first-chamber infusioninclude thiamine chloride hydrochloride, thiamine mononitrate,prosuitiamine, octotiamine, and the like.

The amount of vitamin B1 in the first-chamber infusion may be, for^(.)example, in the range of 1.5 to 10 mg/L, and preferably 2 to 8 mg/L,based on thiamine. In the infusion preparation of the present invention,the mixture of the first- and second-chamber infusions preferably has avitamin B1 concentration of 1 to 6 mg/L, and more preferably 1.5 to 4mg/L.

The fat emulsion incorporated in the first-chamber infusion is anoil-in-water emulsion produced by dispersing an oil and/or fat in waterusing an emulsifying agent. The fat emulsion can be produced accordingto a usual method. For example, after an oil and/or fat, and anemulsifying agent are added to water, the mixture is stirred to preparea crude emulsion. Subsequently, the crude emulsion is emulsified by aconventional method, such as a high-pressure emulsification method.

Examples of oils and fats that can be preferably used include edibleoils. Specific examples thereof include vegetable oils (e.g., soybeanoil, olive oil, cottonseed oil, safflower oil, corn oil, coconut oil,and perilla oil); fish oils (e.g., cod liver oil); medium-chain fattyacid triglycerides (C₈₋₁₀ fatty acid triglycerides) (e.g., product name:PANACET (produced by NOF Corporation), ODO (produced by Nisshin OilMills, Ltd.), COCONARD (produced by Kao Corporation), Miglyol (producedby Mitsuba Trading Co., Ltd.)); synthetic triglycerides (e.g.,2-linoleoyl-1,3-dioctanoyl glycerol (8L8), and2-linoleoyl-1,3-didecanoyl glycerol (10L10)); and the like. Such oilsand fats may be used singly or in a combination of two or more.

The emulsifying agent may be selected from, for example, variouspharmaceutically acceptable emulsifying agents. Specific examplesthereof include egg yolk phospholipid (egg yolk lecithin), hydrogenatedyolk phospholipid, soybean phospholipid (soybean lecithin) ,hydrogenated soybean phospholipid; nonionic surfactants; and the like.Such emulsifiers may be used singly or in a combination of two or more.

Soybean oil is particularly preferable as an oil and/or fat. Egg-yolkphospholipid (egg yolk lecithin) is particularly preferable as anemulsifying agent. Lecithin, such as egg yolk lecithin, is particularlypreferable because it can also act as a phosphorus source, as describedbelow.

Insofar as an oil-in-water fat emulsion can be produced, the amounts ofoil and/or fat and emulsifier used to prepare the fat emulsion are notparticularly limited. The oil and/or fat is typically used in such anamount as to achieve a concentration of about 0.5 to 6 w/v %, andpreferably about 1 to 5 w/v %, in the obtained fat emulsion,Furthermore, the emulsifying agent is typically used in such an amountas to achieve a concentration of about 0.01 to 2 w/v %, and morepreferably about 0.05 to 1 w/v %, in the obtained fat emulsion.

One example of a particularly preferable method for producing the fatemulsion according to the present invention is described below. Morespecifically, an oil and/or fat and an emulsifying agent are added towater, and at least one member selected from glycerol and glucose isalso added thereto. The mixture is then stirred to prepare a crudeemulsion. Subsequently, the crude emulsion is emulsified by aconventional method, such as a high-pressure emulsification method. Thehigh-pressure emulsification method may be carried out, for example, bypassing the crude emulsion through an emulsifier, such as a MantonGaulin homogenizer, at a rate of 20 to 700 kg/cm² about 2 to 50 times,and preferably 3 to 20 times. In this method, insofar as glycerol and/orglucose is present during the emulsification, the manner and timing ofaddition thereof are not limited. For example, glycerol and/or glucosemay be added to the crude emulsion prepared by using an oil and/or fatand an emulsifying agent, and the resulting crude emulsion may beemulsified. The glycerol and/or glucose is typically used in such anamount as to achieve a concentration of about 30 to 70 w/v %, andpreferably about 40 to 60 w/v %, in the obtained fat emulsion.

If necessary, various additives that are known to be added to fatemulsions may be further incorporated. Examples of such additivesinclude pH adjusters. Specific examples of pH adjusters include acidssuch as hydrochloric acid; alkalis such as sodium hydroxide andpotassium hydroxide; and organic acids and amino acids. Examples oforganic acids include acetic acid, lactic acid, citric acid, malic acid,succinic acid, and the like. Examples of amino acids includeL-histidine, L-lysine, and the like. Among these, oil-soluble materialsmay be premixed into an oily component of the emulsion. Water-solublematerials may be mixed into water for injection, or added to an aqueousphase of the obtained fat emulsion. The amounts of additives to be usedcan be suitably determined, and may be the same as conventionally knownamounts.

The fat emulsion is incorporated in the first-chamber infusion in anamount of 0.5 to 6 w/v %, preferably 1 to 5 w/v %, and more preferably 2to 5 w/v %, based on oils and fats. In the infusion preparation of thepresent invention, the mixture of the first- and second-chamberinfusions contains the fat emulsion in a concentration of 0.25 to 6 w/v%, preferably 0.5 to 3 w/v %, and more preferably 1 to 2.5 w/v %, basedon oils and fats.

The first-chamber infusion has a pH in the range of 4.5 to 6.5, andpreferably 5.0 to 6.5. When the pH is within the above-mentioned range,the fat emulsion and vitamin B in the first-chamber infusion can bestabilized. The pH of the first-chamber infusion can be adjusted byusing a pH adjuster, such as hydrochloric acid, acetic acid, glacialacetic acid, lactic acid, malic acid, citric acid, sodium hydroxide, orpotassium hydroxide. L-histidine may also be used as a pH adjuster.

In view of enhancing the stability of vitamin B1, the first-chamberinfusion preferably has a titratable acidity of 1 or less. Thetitratable acidity refers to an amount (mL) of a 0.1 mol/L sodiumhydroxide aqueous solution required to neutralize 100 ml of a solutionto pH 7.4.

Distilled water for injection can be typically used as a solvent of thefirst-chamber infusion.

In the infusion preparation of the present invention, the fluid volumeof the first-chamber infusion is suitably determined according to thetotal fluid volume of the infusion preparation and the fluid volume ofthe second-chamber infusion.

The first-chamber infusion is substantially free of potassium. Thephrase “substantially free of potassium” means that nopotassium-containing compounds are added.

The first-chamber infusion has a relative osmotic pressure of about 2.0to 3.0. The relative osmotic pressure as used herein refers to a ratiorelative to the osmotic pressure of physiological saline (i.e., arelative ratio, with the osmotic pressure of physiological salinedefined as 1). The relative osmotic pressure of the infusion refers to aratio relative to the osmotic pressure of physiological saline, unlessotherwise specified.

Second-Chamber Infusion

The second-chamber infusion used in the present invention contains anamino acid and an electrolyte.

Any amino acid that can be incorporated in amino acid infusions for thepurpose of nutritional supplementation for the body may be used as anamino acid to be contained in the second-chamber infusion. In thepresent invention, the amino acid is typically used in the form of afree amino acid, However, the amino acid may also be used in the form ofa pharmaceutically acceptable salt, an ester, a N-acyl derivative, or adipeptide. Examples of free amino acids that can be incorporated in thesecond-chamber infusion include L-leucine, L-isoleucine, L-valine,L-lysine, L-threonine, L-tryptophan, L-methionine, L-phenylalandne,L-cystene, L-tyrosine, L-argindne, L-histidine, L-alanine, L-proline,L-serine, glycine, L-aspartic acid, L-glutamic acid, and the like.Examples of amino acid salts include inorganic acid salts such asL-arginine hydrochloride, L-cysteine hydrochloride, L-glutamic acidhydrochloride, L-histidine hydrochloride, and L-lysine hydrochloride;organic acid salts such as L-lysine acetate and L-lysine malate; etc.Examples of amino acid esters include L-tyrosine methyl ester,L-methionine methyl ester, L-methionine ethyl ester, and the like.Examples of N-acyl amino acids include N-acetyl-L-cysteine,N-acetyl-L-tryptophan, N-acetyl-L-proline, and the like. Examples ofamino acid dipeptides include L-tyrosyl-L-tyrosine, L-alanyl-L-tyrosine,L-arglnyl-L-tyrosine, L-tyrosyl-L-arginine, and the like. In particular,L-cysteine is preferably incorporated in the form of acetylcysteine inview of stability. Such amino acids may be used singly, but arepreferably used in a combination of two or more, from the viewpoint ofnutritional supplementation. For example, it is preferable toincorporate at least all of the essential amino acids (i.e., 9 types ofamino acids: L-leucine, L-isoleucine, L-valine, L-lysine, L-threonine,L-tryptophan, L-methionine, L-phenylalanine, and L-histidine).

The amount of amino acids in the second-chamber infusion may be, forexample, preferably 40 to 120 g/L, and more preferably 50 to 100 g/L,based on the total amount of free amino acids. In the infusionpreparation of the present invention, the mixture of the first- andsecond-chamber infusions preferably has an amino acid concentration of10 to 50 g/L, and more preferably 20 to 30 g/L, based on the totalamount of free amino acids.

A preferable combination of amino acids to be incorporated in thesecond-chamber infusion, and proportions thereof are, for example, asfollows, in terms of free amino acids: L-leucine: 5 to 15 g/L;L-isoleucine: 3 to 9 g/L L-valine: 3 to 9 g/L; L-lysine: 3 to 12 g/L;L-threonine: 1.2 to 6 g/L; L-tryptophan: 0.3 to 3 g/L; L-methionine: 0.6to 4.8 g/L; L-phenylalanine: 1.8 to 9 g/L; L-cysteine: 0.1 to 1.8 g/L;L-tyrosine: 0.06 to 1.2 g/L; L-arginine: 3 to 12 g/L; L-histidine: 1.2to 6 g/L; L-alanine: 3 to 9 g/L; L-proline: 1.2 to 6 g/L; L-serine: 0.6to 4.2 g/L; glycine: 1.2 to 6 g/L; L-asparfic acid: 0.12 to 1.8 g/L; andL-glutamic acid: 0.12 to 1.8 g/L.

In the infusion preparation of the present invention, the mixture of thefirst- and second-chamber infusions preferably contains amino acids inthe following concentrations, in terms of free amino acids: L-leucine: 3to 9 g/L; L-isoleucine: 1.5 to 4.5 g/L; L-valine: 1.5 to 4.5 g/L;L-lysine: 1.5 to 5 g/L; L-threonine: 0.6 to 3 g/L; L-tryptophan: 0.15 to1.5 g/L; L-methionine: 0.3 to 2.4 g/L; L-phenyialanine: 0.85 to 4.5 g/L;L-cysteine: 0.03 to 0.9 g/L; L-tyrosine: 0.03 to 0.6 g/L; L-arginine:1.5 to 5 g/L; L-histidine: 0.6 to 3 g/L; L-alanine: 1.5 to 4.5 g/L;L-proline: 0.6 to 3 g/L; L-serine: 0.3 to 2.1 g/L; qlycine: 0.6 to 3g/L; L-aspartic acid: 0.06 to 0.9 g/L; and L-glutamic acid: 0.06 to 0.9g/L.

The electrolyte to be incorporated in the second-chamber infusion is anelectrolyte that is used in the infusion field. More specifically, it isan electrolyte contained in a body fluid (body fluid electrolyte) (e.g.,blood and intracellular fluid), which can be said to be aphysiologically important electrolyte. Specific examples of suchelectrolytes include potassium, calcium, sodium, magnesium, phosphorus,zinc, chlorine, and the like. In the infusion preparation of the presentinvention, it is preferable that such an electrolyte not be incorporatedin the first-chamber infusion. In particular, although potassium isusually incorporated in both infusions of a two-chamber infusionpreparation in order to avoid the risk of administering a highconcentration of potassium, potassium is incorporated only in thesecond-chamber infusion according to the infusion preparation of thepresent invention.

Examples of potassium sources include potassium chloride, potassiumacetate, potassium citrate, potassium glycerophosphate, potassiumsulfate, potassium lactate, and the like. Among these, potassiumglycerophosphate is preferable because it also acts as a phosphorussource. Such potassium sources may be in the form of a hydrate.Potassium is incorporated in such an amount as to achieve aconcentration of 40 mEq/L or less (preferably 25 to 40 mEg/L) in thesecond-chamber infusion. In the infusion preparation of the invention,the mixture of the first- and second-chamber infusions has a potassiumconcentration of 16 mEq/L or more (preferably 16 to 25 mEq/L), and morepreferably 16 to 20 mEq/L.

Examples of calcium sources include calcium salts such as calciumgluconate, calcium chloride, calcium glycerophosphate, calcium lactate,calcium pantothenate, and calcium acetate. Calcium salts may be in theform of a hydrate (e.g., calcium gluconate hydrate). Calcium isincorporated in such an amount as to achieve a concentration of 15 mEq/Lor less (preferably 6 to 12 mEq/L) in the second-chamber infusion. Inthe infusion preparation of the invention, the mixture of first- andsecond-chamber infusions has a calcium concentration of 9 mEq/L or less(preferably 3 to 6 mEq/L).

Examples of sodium, sources include sodium salts such as sodiumchloride, sodium lactate, sodium acetate, sodium sulfate, sodiumglycerophosphate, sodium citrate, and sodium lactate. When phosphorus,and calcium and/or magnesium are incorporated in the infusionpreparation of the present invention, sodium citrate is preferably usedas a sodium source in order to prevent precipitation of these elements.Sodium sources may be in the form of a hydrate. Sodium is incorporatedin the second-chamber infusion in a concentration of 50 to 100 mEq/L,and preferably 40 to 80 mEq/L in the second-chamber infusion. In theinfusion preparation of the present invention, the mixture of the first-and second-chamber infusions preferably has a sodium concentration of 25to 50 mEq/L, and preferably 30 to 40 mEq/L.

Examples of magnesium sources include magnesium sulfate, magnesiumchloride, magnesium acetate, and the like. Magnesium sources may be inthe form of a hydrate. The amount of magnesium in the second-chamberinfusion may be, for example, 1 to 20 mEq/L, and preferably 5 to 15mEq/L, in the second-chamber infusion. In the infusion preparation ofthe present invention, the mixture of the first- and second-chamberinfusions preferably has a magnesium concentration of 0.5 to 10 mEq/L,and preferably 2 to 6 mEq/L.

When an inorganic salt is used as a phosphorus source, calcium phosphateand magnesium phosphate may precipitate. Accordingly, an organic salt,such as sodium glycerophosphate or potassium glycerophosphate, ispreferably used. When lecithin is used as an emulsifying agent in thefirst chamber, the lecithin also acts as a phosphorus source. When thephosphorus derived from lecithin can provide a sufficient amount ofphosphorus, it it is unnecessary to incorporate phosphorus in the secondchamber, and no precipitation of calcium phosphate, etc., occurs, whichis preferable. The amount of phosphorus in the second-chamber infusionmay be, for example, 0 to 20 mmol/L. In the infusion preparation of theinvention, the mixture of the first- and second-chamber infusionspreferably has a phosphorus concentration of 1 to 20 mmol/L, and morepreferably 5 to 10 mmol/L.

Examples of zinc sources include zinc sulfate, zinc chloride, and thelike. Zinc sources may be in the form of a hydrate. The amount of zincin the second-chamber infusion is 2.5 to 15 μmol/L. In the infusionpreparation of the invention, the mixture of the first- andsecond-chamber infusions preferably has a zinc concentration of 1.5 to 9μmol/L.

Examples of chlorine sources include sodium chloride, potassiumchloride, magnesium chloride, calcium chloride, and the like. The amountof chlorine in the second-chamber infusion may be, for example, 50 to100 mEq/L, and preferably 40 to 80 mEq/L. In the infusion preparation ofthe present invention, the mixture of the first- and second-chamberinfusions preferably has a chlorine concentration of 25 to 60 mEq/L, andmore preferably 30 to 40 mEq/L.

The pH of the second-chamber infusion is preferably adjusted to 6.0 to7.4, and preferably 6.5 to 7.2, by using a pH adjuster, if necessary.Examples of pH adjusters that can be used may be the same as mentionedabove for the first-chamber infusion. In particular, the use of citricacid is preferable because it can inhibit the precipitation of calciumphosphate. When the second-chamber infusion has a pH within theabove-mentioned range, amino acids that are prone to undergo chemicalchanges, such as L-cysteine and L-glutamic acid, can be stabilized.Furthermore, the pH of the mixture of the second-chamber infusion withthe first-chamber infusion can be maintained in the optimum range asdescribed below.

As a solvent in the second-chamber infusion, distilled water forinjection can be typically used.

In the infusion preparation of the present invention, the second-chamberinfusion has a relative osmotic pressure of about 2.5 to 3.5.

If necessary, the infusion preparation of the present invention maycontain a stabilizer. Examples of stabilizers that can be incorporatedin the infusion preparation of the present invention include sulfitessuch as sodium bisulfite. To avoid the decomposition of vitamin B1contained in the first-chamber infusion, sulfite is incorporated in thesecond-chamber infusion. The amount of sulfite in the second-chamberinfusion may be, for example, 20 to 50 mg/L.

In addition to vitamin B1, various other types of vitamins can be addedto the infusion preparation of the present invention. Various types ofvitamins can be stably added to the infusion preparation in thetwo-chamber container without the need to place the infusion preparationin a three- or four-chamber container. This is one of the features ofthe infusion preparation of the present invention. Vitamins areclassified into water-soluble vitamins and fat-soluble vitamins. In theinfusion preparation of the present invention, a fat-soluble vitamin isadded to the first-chamber infusion. Further, a water-soluble vitaminmay be added to either the first- or second-chamber infusion. However,as described above, vitamin B1 is added to the first-chamber infusion.

Examples of water-soluble vitamins added to the infusion preparation ofthe present invention include B-complex vitamins and vitamin C. Inaddition to vitamin B1 (thiamine), examples of B-complex vitaminsinclude vitamin B2 (riboflavin), vitamin B3 (niacin), vitamin B5(pantothenic acid), vitamin B6, vitamin B7 (biotin) , vitamin B9 (folicacid), and vitamin B12 (cyanocobalamin). Further, examples offat-soluble vitamins include vitamin A, vitamin D (in particular,cholecalciferol), vitamin F, and vitamin K.

When vitamin C (ascorbic acid) is added, it can be added to either orboth of the first- and second-chamber infusions. However, it ispreferably added to the second-chamber infusion. When vitamin C is addedto the second-chamber infusion, the amount of vitamin C in thesecond-chamber infusion is, for example, 50 to 500 mg/L, and preferably100 to 400 mg/L. Further, in the infusion preparation of the presentinvention, the vitamin C concentration in the mixture of the first- andsecond-chamber infusions is preferably set to satisfy the followingranges: generally 25 to 250 mg/L, preferably 50 to 200 mg/L, and morepreferably 40 to 100 mg/L.

As vitamin B2, riboflavin, riboflavin sodium phosphate, flavinmononucleotide, and the like can be used. When vitamin B2 is added, itcan be added to either or both of the first- and second-chamberinfusions. However, vitamin B2 and folic acid are preferably placed indifferent chambers in order to prevent the destabilization of folic acidcaused by a reaction between vitamin B2 and folic acid. For example,when folic acid is added to the first-chamber infusion, vitamin B2 ispreferably added to the second-chamber infusion. When vitamin B2 isadded to the second-chamber infusion, the amount of vitamin B2 in thesecond-chamber infusion is, for example, generally 2.5 to 15 mg/L, andpreferably 4 to 8 mg/L, in terms of riboflavin. Further, in the infusionpreparation of the present invention, the vitamin B2 concentration inthe mixture of the first- and second-chamber infusions is preferably setto satisfy the following ranges: generally 0.5 to 10 mg/L, andpreferably 0.5 to 3 mg/L, in terms of riboflavin.

As vitamin B6, pyridoxine, salts of pyridoxine such as pyridoxinehydrochloride, and the like can be used. When vitamin B6 is added, itcan be added to either or both of the first- and second-chamberinfusions. However, vitamin B6 becomes very unstable to light when itcoexists with vitamin B2. Therefore, vitamin B6 is preferably added tothe infusion to which vitamin B2 is not added. When vitamin B6 is addedto the first-chamber infusion, the amount of vitamin B6 in thefirst-chamber infusion is, for example, generally 2 to 10 mg/L, and.preferably 2.5 to 5 mg/L, in terms of pyridoxine. Further, in theinfusion preparation of the present invention, the vitamin B6concentration in the mixture of the first- and second-chamber infusionsis preferably set to satisfy the following ranges: generally 1 to 10mg/L, and preferably 1.5 to 3.5 mg/L, in terms of pyridoxine.

When folic acid is added, it can be added to either or both of thefirst- and second-chamber infusions; however, it is preferably added tothe first-chamber infusion. When folic acid is added to thefirst-chamber infusion, the amount of folic acid in the first-chamberinfusion is, for example, generally 0.1 to 0.8 mg/L, and preferably 0.2to 0.5 mg/L. Further, in the infusion preparation of the presentinvention, the folic acid concentration in the mixture of the first- andsecond-chamber infusions is preferably set to satisfy the followingranges: generally 0.1 to 0.7 mg/L, and preferably 0.2 to 0.4 mg/L.

As vitamin B12, cyanocobalamin, hydroxocobalamin acetate,methylcobalamin, and the like can be used. When vitamin B12 is added, itcan be added to either or both of the first- and second-chamberinfusions; however, it is preferably added to the first-chamberinfusion. When vitamin B12 is added to the first-chamber infusion, theamount of vitamin B12 in the first-chamber infusion is, for example, 2to 10 μg/L, and preferably 2.5 to 5 μg/L. Further, in the infusionpreparation of the present invention, the vitamin B12 concentration inthe mixture of the first- and second-chamber infusions is preferably setto satisfy the following ranges: generally 0.5 to 10 mg/L, andpreferably 0.5 to 3 mg/L.

As niacin, for example, nicotinamide can be preferably used. When niacinis added, it can be added to either or both of the first- andsecond-chamber infusions; however, it is preferably added to thesecond-chamber infusion. When niacin is added to the second-chamberinfusion, the amount of niacin in the second-chamber infusion is, forexample, 10 td 100 mg/L, and preferably 20 to 50 mg/L. Further, in theinfusion preparation of the present invention, the niacin concentrationin the mixture of the first- and second-chamber infusions is preferablyset to satisfy the following ranges: generally 5 to 50 mg/L, andpreferably 5 to 20 mg/L.

As pantothenic acid, panthenol can be preferably used. When pantothenicacid is added, it can be added to either or both of the first- andsecond-chamber infusions; however, it is preferably added to thesecond-chamber infusion. When pantothenic acid is added to thesecond-chamber infusion, the amount of pantothenic acid in thesecond-chamber infusion is, for example, 5 to 30 mg/L, and preferably 10to 20 mg/L, in the case of panthenol. Further, in the infusionpreparation of the present invention, the panthenol concentration in themixture of the first- and second-chamber infusions is preferably set tosatisfy the following: ranges: generally 2.5 to 15 mg/L, and preferably5 to 10 mg/L.

When biotin is added, it can be added to either or both of the first-and second-chamber infusions; however, it is preferably added to thesecond-chamber infusion. When biotin is added to the second-chamberinfusion, the amount of biotin in the second-chamber infusion is, forexample, 10 to 100 μg/L, and preferably 20 to 80 μg/L. Further, in theinfusion preparation of the present invention, the biotin concentrationin the mixture of the first- and second-chamber infusions is preferablyset to satisfy the following ranges: generally 1 to 50 μg/L, andpreferably 10 to 40 μg/L.

As vitamin A, retinol palmitate can be preferably used. Further, vitaminA oil formed by dissolving retinol palmitate in oil can also be used.Vitamin A is fat-soluble, and is added to the first-chamber infusion.The amount of vitamin A in the first-chamber infusion is, for example,1,000 to 5,000 IU/L, and preferably 2,000 to 4,000 IU/L. Further, in theinfusion preparation of the present invention, the vitamin Aconcentration in the mixture of the first- and second-chamber infusionsis preferably set to satisfy the following ranges: generally 500 to2,500 IU/L, and preferably 1,000 to 2,000 IU/L. IU stands forInternational Unit. It is also called vitamin A unit.

As vitamin D, cholecalciferol (vitamin D₃) can be preferably used.Vitamin D is fat-soluble, and is added to the first-chamber infusion.The amount of vitamin D in the first-chamber infusion is, for example, 2to 10 μg/L, and preferably 2.5 to 5 μg/L. Further, in the infusionpreparation of the present invention, the vitamin D concentration in themixture of the first- and second-chamber infusions is preferably set tosatisfy the following ranges: generally 0.5 to 10 μg/L, and preferably0.5 to 3 μg/L.

As vitamin F, tocopherol acetate can be preferably used. Vitamin F isfat-soluble, and is added to the first-chamber infusion. The amount ofvitamin E in the first-chamber infusion is, for example, 2 to 50 mg/L,and preferably 5 to 20 mg/L. Further, in the infusion preparation of thepresent invention, the vitamin D concentration in the mixture of thefirst- and second-chamber infusions is preferably set to satisfy thefollowing ranges: generally 1 to 25 mg/L, and preferably 2.5 to 10 mg/L.

As vitamin K, phytonadione (vitamin K₁) can be preferably used. VitaminK is fat-soluble, and is added to the first-chamber infusion. The amountof vitamin K in the first-chamber infusion is, for example, 50 to 2,500μg/L, and preferably 80 to 2,000 μg/L. Further, in the infusionpreparation of the present invention, the vitamin K concentration in themixture of the first- and second-chamber infusions is preferably set tosatisfy the following ranges: generally 20 to 1,200 μg/L, and preferably30 to 1,000 μg/L.

A preferable example of the first- and second-chamber infusioncompositions is shown below.

First-Chamber Infusion

-   Purified soybean oil: 10-50 g/L-   Glucose: 70-150 g/L-   Thiamine chloride hydrochloride: 3-10 mg/L-   Pyridoxine hydrochloride: 3-7 mg/L-   Cyanocobalamin: 2.5-5 μg/L-   Folic acid: 0.2-0.5 mg/L-   Vitamin A oil: 2,000-4,000 IU/L-   Cholecalciferol: 2.5-5 μg/L-   Tocopherol acetate: 5---20 mg/L-   Phytonadlone: 80-2,000 μg/L

Second-Chamber Infusion

-   L-leucine. 5-15 g/L-   L-isoleucine: 3-9 g/L-   L-valine: 3-9 g/L-   L-lysine hydrochloride: 3.5-15 g/L-   L-threonine: 1.2-6 g/L-   L-tryptophan: 0.3-3 g/L-   L-methionine: 0.6-4.8 g/L-   Acetylcysteine: 0.13-2.4 g/L-   L-phenylalanine: 1.8-9 g/L-   L-tyrosine: 0.06-1.2 g/L-   L-arginine: 3-12 g/L-   L-histidine: 1.2-6 g/L-   L-alanine: 3-9 g/L-   L- proline: 1.2-6 g/L-   L-serine: 0.6-4.2 g/L-   Glycine: 1.2-6 g/L-   L-asparatic acid: 0.12-1.8 g/L-   L-glutamic acid: 0.12-1.8 g/L-   Sodium: 40-80 mEq/L-   Potassium: 25-40 mEq/L-   Calcium: 6-12 mEq/L-   Magnesium: 5-15 mEq/L-   Chlorine: 40-80 mEq/L-   Phosphorus: 0-20 mmoL/L-   Zinc: 2.5-15 μmol/L-   Riboflavin. Sodium Phosphate: 5-10 mg/L-   Ascorbic acid: 0.1-0.4 g/L-   Biotin: 20-80 μg/L-   Nicotinamide: 20-50 mg/L-   Panthenol: 9-19 mg/L

Both of the first- and second chamber infusions can be produced by aknown method for producing: infusions. For example, the first- andsecond chamber infusions can be produced by dissolving each of theabove-described infusion components in distilled water for injection.Fat-soluble components are preferably used, for example, after beingemulsified as described above.

Mixture of the First- and Second-Chamber Infusions

The infusion preparation of the present invention is used by mixing thefirst-chamber infusion and the second-chamber infusion at the time ofuse. In order to improve the safety by suppressing the occurrence ofvascular pain and phlebitis, it is desirable that the mixture of thefirst- and second-chamber infusions have a pH of 6 to 7.4, andpreferably 6.5 to 7.0, a titratable acidity of 1 to 10, and a relativeosmotic pressure of 2 to 3.

Further, in the infusion preparation of the present invention, thevolume ratio between the first-chamber infusion and the second-chamberinfusion is suitably determined according to the above-described amountof the first- and second-chamber infusions and the like. In view of thestability of each component contained and the osmotic pressure settingin each chamber, the volume ratio (first-chamber infusion:second-chamberinfusion) is, for example, 3:2-3:5.

Further, the calorific value of the mixture is preferably 450 to 750kcal/L, more preferably 500 to 650 kcal/L. In this calorific value, thepercentage of fat is preferably 40% or less, and more preferably 20 to40%. Further, in this calorific value, the percentages of sugar, fat,and amino acid are preferably as follows: 40 to 60% of sugar; 20 to 40%of fat; and 10 to 30% of amino acid, and more preferably, 45 to 55% ofsugar; 25 to 35% of fat; and 15 to 25% of amino acid.

An approximate calorific value of each component can be determined bymultiplying the amount (g) by 4 for sugar, by 9 for fat, and by 4 foramino acid, Specifically, the calorific value of sugar is about 4kcal/g, the calorific value of fat is about 9 kcal/g, and the calorificvalue of amino acid is about 4 kcal/g. An approximate calorific valuecan be determined based on this information. The calorific value of themixture described above is based on a value calculated by the aboveformula.

A preferable example of the composition of ear component in the mixtureis shown below.

TABLE 1 Amount Components (1,000 mL) Electrolytes Na 35 mEq K 20 mEq Mg5 mEq Ca 5 mEq Cl 35 mEq P 10 mmol Zn 5 μmol Sugar Glucose 75 g FatPurified soybean oil 20 g Amino acid Amino acid 30 g Vitamins Thiaminechloride hydrochloride 1.9 mg Riboflavin sodium phosphate 2.3 mgPyridoxine hydrochloride 2.45 mg Cyanocobalamin 2.5 μg Nicotinamide 20mg Panthenol 7 mg Folic acid 0.2 mg Biotin 30 μg Ascorbic acid 50 mgVitamin A oil 1,650 IU Cholecalciferol 2.5 μg Tocopherol acetate 5 mgPhytonadione 1 mg

Infusion Preparation Usage Form

The infusion preparation of the present invention is used in order tomanage the nutrition of a perioperative patient when the patient hasmild hypoproteinemia or mild malnutrition due to inadequate oral intakeor when the patient is in the invasive phase. In particular, theinfusion preparation is suitably used to manage the nutrition of apatient having difficulty receiving oral nutritional support in thepostoperative period or due to a digestive disorder and the like(preferably, a patient who has undergone gastric resection surgery). Theinfusion preparation of the present invention is administered to apatient for 1 to 14 days after surgery, and preferably 1 to 3 days aftersurgery. Thereby, the nutritional status of the patient can bemaintained in a healthy state. The dose and the dosing rate can besuitably determined in view of each patient's symptoms, age, and thelike. In particular, when the infusion preparation of the presentinvention is used, the infusion preparation can maintain, by itself, thenutritional status of the patient in a healthy state for the duration ofadministration.

The infusion preparation of the present invention is preferablyadministered into a peripheral vein. In other words, the infusionpreparation of the present invention is preferably an infusionpreparation for peripheral intravenous administration. Usually, when aninfusion is administered into a peripheral vein, if the osmotic pressureof the infusion is too high, it may cause vascular pain or phlebitis.However, there is no such risk when the infusion preparation of thepresent invention is used. Therefore, the effect of the infusionpreparation of the present invention is preferably demonstrated when theinfusion preparation is administered into a peripheral vein.

Infusion Container

The container in which the first-chamber infusion and the second-chamberinfusion are placed is not particularly limited insofar as the containerhas two chambers that are intercommunicable. Examples includetwo-chamber containers (infusion bags) in which the chambers areseparated by a partition wall that can be communicably opened, such asones in which a partition wall is formed by an easily peelable seal(Japanese Unexamined Patent Publication No. H2-4671, JapaneseUnexamined. Utility Model Publication. No. H5-5138, and the like); onesin which a partition wall is formed by clipping the space between thechard (Japanese Unexamined Patent Publication No. S63-309263, and thelike); and ones in which various communicating means that can open thepartition wall is provided to the partition wall (Japanese ExaminedPatent Publication No. S63-20550, and the like). Of these, an infusionbag in which the partition wall is formed by an easily peelable seal ispreferable because it is suitable for mass production and the chamberscan be easily brought into communication. Further, various gas-permeableplastics commonly used for medical containers are used as materials ofthe above container. Examples include flexible plastics, such aspolyethylene, polypropylene, polyvinyl chloride, crosslinkedethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, blends ofsuch polymers, and laminates comprising such polymers.

The first- and second-chamber infusions can be placed and contained inthe container by a conventional method. For example, the chambers arefilled with the respective infusions under an inert gas atmosphere,sealed, and sterilized by heat. Heat sterilization can be performed by aknown method, such as high-pressure steam sterilization or hot watershower sterilization. If necessary, the heat sterilization can becarried out in an inert gas atmosphere such as carbon dioxide ornitrogen.

Further, the first- and second-chamber infusions contained in thecontainer are preferably packaged together with an oxygen absorber in anoxygen barrier exterior bag, in order to reliably prevent degenerationand oxidation. Particularly when an infusion bag in which the partitionwall is formed by an easily peelable seal is used as a container, theinfusion bag is preferably packaged in such a manner that the infusionbag is folded, for example, in half, at the easily peelable seal portionso that the partition wall will not be communicably opened by externalpressure. Further, for example, the package may be filled with an inertgas if necessary.

Commonly widely used films, sheets, and the like formed from variousmaterials can be used as materials of the oxygen barrier exterior bag,which are suitable for the package. Specific examples include ethylenevinylalcohol copolymer, poiyvinylidene chloride, polyacrylonitrile,polyvinyl alcohol, polyamide, and polyester. Examples also include filmsand sheets formed from materials comprising at least one of theabove-mentioned materials.

Further, as the oxygen absorber, various known types can be used. Forexample, ones comprising, as an active ingredient, an iron compound suchas ferric hydroxide, ferric oxide, or iron carbide, and ones comprisinglow-molecular-weight phenol and activated carbon, can be used. Tradenames of typical commercial products include “Ageless” (produced byMitsubishi Gas Chemical) , “Moduran” (produced by Nippon Kayaku) ,“Secur” (produced by Nippon Soda) , “Tamotsu” (produced by Oji Kako) ,and “Keepit” (produced by Drency).

EXAMPLES

The present invention is described in further detail below in referenceto Examples, but is not limited thereto.

Example 1 Formulation of Infusion Preparation 1. Formulation ofFirst-Chamber Infusion

Purified soybean oil, purified egg yolk lecithin, and glucose in theamounts shown in Table 2 were added to water. The mixture was subjectedto crude emulsification using a homomixer. The result was subjected tofine emulsification using a high-pressure emulsifier (Manton-Gaulin),and water was further added thereto to make the total amount 250 mL. ThepH was adjusted to about 6.0 using a pH adjuster (L-histidine andhydrochloric acid). The first-chamber infusion thus obtained had arelative osmotic pressure of 3.0, and a titratabie acidity of 0.5.

TABLE 2 Components of First-Chamber Infusion Purified soybean oil 10 gGlucose 37.5 g Purified egg yolk lecithin 1.2 g L-histidine 0.04 g

2. Formulation of Second-Chamber Infusion

Amino acids, electrolytes, and a stabilizer (sodium hydrogen sulfite) inthe amounts shown in Table 3 were dissolved in distilled water forinjection to prepare an amino acid electrolyte solution. The pH of thesolution was adjusted to 6.7 with glacial acetic acid, and the totalamount was adjusted to 250 mL, giving the second-chamber infusion. Thesecond-chamber infusion thus prepared had a relative osmotic pressure of3.0 and potassium concentration of 40 mEq/L.

TABLE 3 Components of Second-Chamber Infusion L-leucine 2.100 gL-isoleucine 1.200 g L-valine 1.200 g L-lysine hydrochloride 1.965 gL-threonine 0.855 g L-tryptophan 0.300 g L-methionine 0.585 gAcetylcysteine 0.202 g L-phenylalanine 1.050 g L-tyrosine 0.075 gL-arginine 1.575 g L-histidine 0.750 g L-alanine 1.200 g L-proline 0.750g L-serine 0.450 g Glycine 0.885 g L-asparatic acid 0.150 g L-glutamicacid 0.150 g Sodium chloride 0.220 g Potassium chloride 0.220 g Sodiumcitrate 0.310 g Sodium acetate 0.403 g Sodium lactate (72% solution)1.167 g Potassium glycerophosphate (50% solution) 1.750 g Calciumgluconate hydrate 0.561 g Magnesium sulfate hydrate 0.309 g Zinc sulfatehydrate 0.70 mg Sodium hydrogen sulfite 12.5 mg

3. Filling and Packaging

250 mL of the first-chamber infusion and 250 mL of the second-chamberinfusion obtained above were each placed in each chamber of thetwo-chamber polyethylene container wherein the chambers were partitionedby an easily peelable seal. The atmosphere in the vacant space of eachchamber was replaced with nitrogen gas. After sealing, the container wassubjected to high-pressure steam sterilization according to aconventional method. Thereafter, the container was folded at the easilypeelable seal portion, and enclosed in an exterior bag (oxygen-barrierexterior bag) formed from a multilayered-barrier film (Product name:Bovlon, produced by NSR (Nippon Synthetic Chemical industry Co., Ltd.)together with a deoxidant (Product name: Ageless, produced by MitsubishiGas Chemical Company, Inc.), obtaining an infusion preparation. Notethat the mixture (the components are shown in Table 4) of thefirst-chamber infusion and the second-chamber infusion of the infusionpreparation had a pH of 6.7, a titratable acidity of 7, and a potassiumconcentration of 20 mEq/L. During storage for 3 days from the time ofmixing, the mixed infusion exhibited a volume ratio of coarse particleshaving a particle size of 0.5 μm or more of^(.) 0.05% or less, which waslower than the requirements of the United States Pharmacopeia (USP),indicating that the fat particles thereof were stable. The particle sizewas measured using AccuSizer 780 (produced by Perticle Sizing System).

TABLE 4 Components of Mixed Infusion Amount Components (500 mL) SugarGlucose 37.5 g Fat Soybean oil 10 g Amino acids L-leucine 2.100 gL-isoleucine 1.200 g L-valine 1.200 g L-lysine hydrochloride 1.965 gL-threonine 0.855 g L-tryptophan 0.300 g L-methionine 0.585 gAcetylcysteine 0.202 g L-phenylalanine 1.050 g L-tyrosine 0.075 gL-arginine 1.575 g L-histidine 0.790 g L-alanine 1.200 g L-proline 0.750g L-serine 0.450 g Glycine 0.885 g L-asparatic acid 0.150 g L-glutamicacid 0.150 g Electrolytes Na 17.5 mEq K 10 mEq Mg 2.5 mEq Ca 2.5 mEq Cl17.5 mEq P 5 mmol Zn 2.5 μmol

Example 2 Formulation of Infusion Preparation 1. Formulation ofFirst-Chamber Infusion

250 mL of a fluid comprising 0.96 mg of thiamine chloride hydrochloridein addition to the components shown in Table 2 was prepared in the samemanner as in Example 1 to obtain a first-chamber infusion. The pH of thefirst-chamber infusion was adjusted to about 6.0. The first-chamberinfusion had a relative osmotic pressure of 3 and a titratable acidityof 0.5.

2. Formulation of Second-Chamber Infusion

A second-chamber infusion was prepared in the same manner as in Example1.

3. Filling and Packaging

250 mL of the first-chamber infusion and 250 mL of the second-chamberinfusion obtained above were each placed in each chamber of thetwo-chamber polyethylene container wherein the chambers were partitionedby an easily peelable seal. The atmosphere in the vacant space of eachchamber was replaced with nitrogen gas. After sealing, the container wassubjected to high-pressure steam sterilization according to aconventional method. Thereafter, the container was folded at the easilypeelable seal portion, and enclosed in an exterior bag (oxygen-barrierexterior bag) formed from a multilayered-barrier film. (Product name:Bovlon, produced by NSR) together with a deoxidant (Product name:Ageless, produced by Mitsubishi Gas Chemical Company, Inc.), obtainingan infusion preparation. Note that the mixture (the components are shownin Table 5) of the first-chamber infusion and the second-chamberinfusion of the infusion preparation had a pH of 6.7, a titratableacidity of 7, and a potassium concentration of 20 mEq/L. During storagefor 3 days from the time of mixing, the mixed infusion exhibited avolume ratio of coarse particles having a particle size of 0.5 μm ormore of 0.05% or less, indicating that the fat particles thereof werestable.

TABLE 5 Components of Mixed Infusion Amount Components (500 mL) SugarGlucose 37.5 g Fat Soybean oil 10 g Amino acids L-leucine 2.100 gL-isoleucine 1.200 g L-valine 1.200 g L-lysine hydrochloride 1.965 gL-threonine 0.855 g L-tryptophan 0.300 g L-methionine 0.585 gAcetylcysteine 0.202 g L-phenylalanine 1.050 g L-tyrosine 0.075 gL-arginine 1.575 g L-histidine 0.790 g L-alanine 1.200 g L-proline 0.750g L-serine 0.450 g Glycine 0.885 g L-asparatic acid 0.150 g L-glutamicacid 0.150 g Electrolytes Na 17.5 mEq K 10 mEq Mg 2.5 mEq Ca 2.5 mEq Cl17.5 mEq P 5 mmol Zn 2.5 μmol Vitamins Thiamine chloride hydrochloride0.96 mg

Example 3 Formulation of Infusion Preparation 1. Formulation ofFirst-Chamber Infusion

250 mL of fluid comprising 2.75 mg of vitamin A oil (825 IU), 1.25 μg ofcholecalciferol, 2.5 mg of tocopherol acetate, 1 mg of phytonadione,0.96 mg of thiamine chloride hydrochloride, 1.23 mg of pyridoxinehydrochloride, 1.25 μg of cyanocobalamin, and 0.1 mg of folic acid inaddition to the components shown in Table 2 was prepared in the samemanner as in Example 1 to obtain a first-chamber infusion. The vitamin Aoil, cholecalciferol, tocopherol acetate, and phytonadione weredissolved in the purified soybean oil beforehand. The pH of thefirst-chamber infusion was adjusted to about 6.0. The first-chamberinfusion had a relative osmotic pressure of 3.0 and a titratable acidityof 0.5.

2. Formulation of Second-Chamber Infusion

250 of fluid comprising 25 mg of ascorbic acid, 15 μg of biotin, 10 mgof nicotinamide, 3.5 mg of panthenol, and 1.15 mg of riboflavin sodiumphosphate in addition to the components shown in Table 3 was prepared inthe same manner as in Example 1 to obtain a second-chamber infusion. Thesecond-chamber infusion had a relative osmotic pressure of 3 and apotassium concentration of 40 mEq/L. The pH of the second-chamberinfusion was adjusted to 6.7.

3. Filling and Packaging

250 mL of the first-chamber infusion and 250 mL of the second-chamberinfusion obtained above were each placed in each chamber of thetwo-chamber polyethylene container wherein the chambers were partitionedby an easily peelable seal. The atmosphere in the vacant space of eachchamber was replaced with nitrogen gas. After sealing, the container wassubjected to high-pressure steam sterilization according to aconventional method. Thereafter, the container was folded at the easilypeelable seal portion, and enclosed in an exterior bag (oxygen-barrierexterior bag) formed from a multilayered-barrier film (Product name:Bovlon, produced by NSR) together with a deoxidant (Product name:Ageless, produced by Mitsubishi Gas Chemical Company, Inc.), obtainingan infusion preparation. Note that the mixture (the components are shownin Table 6) of the first-chamber infusion and the second-chamberinfusion of the infusion preparation had a pH of 6.7, a. titratableacidity of 7, and a potassium concentration of 20 mEq/L. During storagefor 3 days from the time of mixing, the mixed infusion exhibited avolume ratio of coarse particles having a particle size of 0.5 μm ormore of 0.05% or less, indicating that the fat particles thereof werestable.

TABLE 6 Components of Mixed Infusion Amount Components (500 mL) SugarGlucose 37.5 g Fat Soybean oil 10 g Amino acids L-leucine 2.100 gL-isoleucine 1.200 g L-valine 1.200 g L-lysine hydrochloride 1.965 gL-threonine 0.855 g L-tryptophan 0.300 g L-methionine 0.585 gAcetylcysteine 0.202 g L-phenylalanine 1.050 g L-tyrosine 0.075 gL-arginine 1.575 g L-histidine 0.790 g L-alanine 1.200 g L-proline 0.750g L-serine 0.450 g Glycine 0.885 g L-asparatic acid 0.150 g L-glutamicacid 0.150 g Electrolytes Na 17.5 mEq K 10 mEq Mg 2.5 mEq Ca 2.5 mEq Cl17.5 mEq P 5 mmol Zn 2.5 μmol Vitamins Thiamine chloride hydrochloride0.96 mg Riboflavin sodium phosphate 1.15 mg Pyridoxine hydrochloride1.23 mg Cyanocobalamin 1.25 μg Nicotinamide 10 mg Panthenol 3.5 mg Folicacid 0.10 mg Biotin 15 μg Ascorbic acid 25 mg Vitamin A oil 825 IUCholecalciferol 1.25 μq Tocopherol acetate 2.5 mg Phytonadione 1 mg

The infusion preparation (before mixing the first-chamber. infusion andthe second-chamber infusion) was stored at room temperature for 6months. Thereafter, the amount of each vitamin component contained inthe first-chamber infusion or the second-chamber infusion was measuredusing HPLC. Table 7 shows the results. As is clear from the results,each of the vitamin components can be stably present in the infusionpreparation even after 6 months storage.

TABLE 7 Remaining rate after 6 months storage (%) Riboflavin sodiumphosphate 100.1 Ascorbic acid 99.9 Biotin 97.8 Nicotinamide 99.6Panthenol 100.4 Thiamine chloride hydrochloride 98.7 Pyridoxinehydrochloride 99.3 Cyanocobalamin 103.2 Folic acid 100.0 Cholecalciferol100.5 Tocopherol acetate 99.0 Phytonadione 101.5 Vitamin A oil 102.2

Example 4 Formulation of Infusion Preparation 1. Formulation ofFirst-Chamber Infusion

300 mL of fluid comprising 2.75 mg of vitamin A oil (825 IU), 1.25 μg ofcholecalciferol, 2.5 mg of tocopherol acetate, 37.55 μg of phytonadione,1.92 mg of thiamine chloride hydrochloride, 1.82 mg of pyridoxinehydrochloride, 1.25 μg of cyanocobalamin, and 0.15 mg of folic acid inaddition to the components shown in Table 2 was prepared in the samemanner as in Example 3 to obtain a first-chamber infusion. The pH of thefirst chamber infusion was adjusted to about 6.0. The first-chamberinfusion had a relative osmotic pressure of 2.5 and a titratable acidityof 0.5.

2. Formulation of Second-Chamber Infusion

250 mL of fluid comprising 50 mg of vitamin C (ascorbic acid), 15 μg ofbiotin, 10 mg of nicotinamide, 3.5 mg of panthenol, and 1.15 mg ofvitamin B2 (riboflavin sodium phosphate) was prepared in the same manneras in Example 3 to obtain a second-chamber infusion. The pH of thesecond-chamber infusion was adjusted to 6.7. The second-chamber infusionhad a relative osmotic pressure of 3.0 and a potassium concentration of40 mEq/L.

3. Filling and Packaging

300 mL of the first-chamber infusion and 250 mL of the second-chamberinfusion obtained above were each placed in each chamber of thetwo-chamber polyethylene container wherein the chambers were partitionedby an easily peelable seal. The atmosphere in the vacant space of eachchamber was replaced with nitrogen gas. After sealing, the container wassubjected Co high-pressure steam sterilization according to aconventional method. Thereafter, the container was folded at the easilypeelable seal portion, and enclosed in an exterior bag (oxygen barrierexterior bag) formed from a multilayered-barrier film (Product name:Bovlon, produced by NSR) together with a deoxidant (Product name:Ageless, produced by Mitsubishi Gas Chemical Company, Inc.), obtainingan infusion preparation. Note that the mixture (the components are shownin Table 8) of the first-chamber infusion and the second-chamberinfusion of the infusion preparation. had a pH of 6.7, a titratableacidity of 6, and a potassium. concentration of 18.2 mEq/L. Duringstorage for 3 days from the time of mixing, the mixed infusion exhibiteda volume ratio of coarse particles having a particle size of 0.5 μm ormore of 0.05% or less, indicating that the fat particles thereof werestable.

TABLE 8 Components of Mixed Infusion Amount Components (550 mL) SugarGlucose 37.5 g Fat Soybean oil 10 g Amino acids L-leucine 2.100 gL-isoleucine 1.200 g L-valine 1.200 g L-lysine hydrochloride 1.965 gL-threonine 0.855 g L-tryptophan 0.300 g L-methionine 0.585 gAcetylcysteine 0.202 g L-phenylalanine 1.050 g L-tyrosine 0.075 gL-arginine 1.575 g L-histidine 0.790 g L-alanine 1.200 g L-proline 0.750g L-serine 0.450 g Glycine 0.885 g L-asparatic acid 0.150 g L-glutamicacid 0.150 g Electrolytes Na 17.5 mEq K 10 mEq Mg 2.5 mEq Ca 2.5 mEq Cl17.5 mEq P 5 mmol Zn 2.5 μmol Vitamins Thiamine chloride hydrochloride1.92 mg Riboflavin sodium phosphate 1.15 mg Pyridoxine hydrochloride1.82 mg Cyanocobalamin 1.25 μg Nicotinamide 10 mg Panthenol 3.5 mg Folicacid 0.15 mg Biotin 15 μg Ascorbic acid 50 mg Vitamin A oil 825 IUCholecalciferol 1.25 μg Tocopherol acetate 2.5 mg Phytonadione 37.5 μg

Comparative Example 1 Formulation of Infusion Preparation. 1.Formulation of First-Chamber Infusion

Purified soybean oil, purified egg yolk lecithin, and glucose in theamounts shown in Table 2 were added to water. The mixture was subjectedto crude emulsification using a homomixer. The result was subjected tofine emulsification using a high-pressure emulsifier (Manton-Gaulin),and water was added thereto to make the total amount 350 mL. The pH wasadjusted to about 6.0 using a pH adjuster (L-histidine and hydrochloricacid). The first-chamber infusion thus obtained had a relative osmoticpressure of 2.1, and a titratable acidity of 0.5.

2. Formulation of Second-Chamber Infusion

150 mL of fluid comprising the components shown in Table 3 was preparedin the same manner as in Example 1 to obtain a second-chamber infusion.The pH of The second-chamber infusion was adjusted to 6.7. Thesecond-chamber infusion had a relative osmotic pressure of 5 and apotassium concentration of 67 mEq/L.

3. Filling and Packaging

350 mL of the first-chamber infusion and 150 mL of the second-chamberinfusion obtained above were each placed in each chamber of thetwo-chamber polyethylene container wherein the chambers were partitionedby an easily peelable seal. The atmosphere in the vacant space of eachchamber was replaced with nitrogen gas. After sealing, the container wassubjected to high-pressure steam sterilization according to aconventional method. Thereafter, the container was folded at the easilypeelable seal portion, and enclosed in an exterior bag (oxygen-barrierexterior bag) formed from a multilayered-barrier film (Product name:Bovlon, produced by PER) together with a deoxidant (Product name:Ageless, produced by Mitsubishi Gas Chemical Company, Inc.), obtainingan infusion preparation. The mixed infusion of the first-chamberinfusion and the second-chamber infusion of the infusion preparation,comprised the same components at the same proportions as that inExample 1. However, in the formulation of Comparative Example 1, thesecond-chamber infusion had a high potassium concentration of 67 mEq/L;therefore, it the infusion preparation were used before opening thepartition, a high concentration of potassium would undesirably beadministered into the body, thus making it extremely dangerous.Furthermore, the relative osmotic pressure in the second chamber wasvery high at 5 and adverse effects such as phlebitis caused therebycannot be neglected.

1. An infusion preparation comprising two chambers separated by apartition that can be communicably opened, wherein a first chambercontains a first-chamber infusion comprising a sugar, a fat emulsion,vitamin B6 and folic acid; a second chamber contains a second-chamberinfusion comprising an amino acid, an electrolyte and vitamin B2;vitamin B6 and folic acid are placed in the first chamber only, vitaminB2 is placed in the second chamber only, the first-chamber infusion issubstantially free of potassium, and has a relative osmotic pressure of2.0 to 3.0; the second-chamber infusion has a potassium concentration of40 mEq/L or less and a relative osmotic pressure of 2.5 to 3.5; and amixture of the first- and second-chamber infusions has a potassiumconcentration of 16 mEq/L or more as measured upon communicably openingthe partition.
 2. The infusion preparation according to claim 1 whereinthe first-chamber infusion has a pH of 4.5 to 6.5, and thesecond-chamber infusion has a pH of 6.0 to 7.4.
 3. The infusionpreparation according to claim 1, wherein the volume ratio of thefirst-chamber infusion to the second-chamber infusion is 3:2 to 3:5. 4.The infusion preparation according to claim 2, wherein the volume ratioof the first-chamber infusion to the second-chamber infusion is 3:2 to3:5.
 5. The infusion preparation according to claim 1, wherein the firstchamber further contains vitamin B1.
 6. The infusion preparationaccording to claim 2, wherein the first chamber further contains vitaminB1.
 7. The infusion preparation according to claim 3, wherein the firstchamber further contains vitamin B1.
 8. The infusion preparationaccording to claim 4, wherein the first chamber further contains vitaminB1.